when I try to log in in the same lan to the ftp server I have no problem but I get a line in /var/log/massages:
Nov 12 23:55:28 attackbox vsftpd(pam_uni:evil:[3353]: check pass; user unknown
Nov 12 23:55:28 attackbox vsftpd(pam_uni:evil:[3353]: authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=192.168.1.11

but there is no problem to log in
when I try to log in from the internet I see this error: